EP 1499842 A1 20050126 - INDUCTION FURNACE FOR HIGH TEMPERATURE OPERATION
Title (en)
INDUCTION FURNACE FOR HIGH TEMPERATURE OPERATION
Title (de)
INDUKTIONSOFEN FÜR HOCHTEMPERATURBETRIEB
Title (fr)
FOUR A INDUCTION POUR UN FONCTIONNEMENT A TEMPERATURE ELEVEE
Publication
Application
Priority
- US 0310416 W 20030403
- US 11569402 A 20020404
Abstract (en)
[origin: US6898232B2] An induction furnace capable of operation at temperatures of over 3100° C. has a cooling assembly ( 60 ), which is selectively mounted to an upper end of the furnace wall ( 76 ). The cooling assembly includes a dome ( 62 ), which is actively cooled by cooling water coils ( 68 ). During the cool-down portion of a furnace run, cooling initially proceeds naturally, by conduction of heat away from the hot zone through a furnace insulation layer ( 58 ). Once the temperature within the furnace hot zone ( 20 ) reaches about 1500° C., a lifting mechanism ( 80 ), mounted to the dome, raises a cap ( 16 ) of the furnace slightly, allowing hot gases from the hot zone to mix with cooler gas in the dome. This speeds up cooling of the hot zone, reducing cool-down times significantly, without the need for encumbering the furnace itself with valves or other complex cooling mechanisms which have to be replaced periodically. The life of a graphite furnace susceptor ( 10 ) at the high operating temperature is increased by surrounding the susceptor with a barrier layer ( 40 ) of flexible graphite, which inhibits evaporation of the graphite. Additionally, witness disks ( 154 ), placed within the susceptor, provide an accurate temperature profile of the hot zone.
IPC 1-7
IPC 8 full level
D01F 9/32 (2006.01); H05B 6/10 (2006.01); C01B 31/04 (2006.01); F27B 14/06 (2006.01); F27B 17/00 (2006.01); F27D 1/12 (2006.01); F27D 7/06 (2006.01); F27D 11/06 (2006.01); F27D 21/00 (2006.01); F27D 9/00 (2006.01); F27D 99/00 (2010.01)
CPC (source: EP US)
D01F 9/322 (2013.01 - EP US); F27B 14/061 (2013.01 - EP US); F27D 2009/0018 (2013.01 - EP US); F27D 2099/002 (2013.01 - EP US)
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
DOCDB simple family (publication)
US 2003189965 A1 20031009; US 6724803 B2 20040420; AT E520807 T1 20110915; AU 2003221812 A1 20031027; BR 0308931 A 20050104; CA 2481247 A1 20031023; CA 2481247 C 20100316; CN 1659415 A 20050824; CN 1659415 B 20100526; EP 1499842 A1 20050126; EP 1499842 A4 20080917; EP 1499842 B1 20110817; JP 2005521855 A 20050721; RU 2004132207 A 20050510; RU 2326319 C2 20080610; US 2005013339 A1 20050120; US 6898232 B2 20050524; WO 03087689 A1 20031023; ZA 200407915 B 20051130
DOCDB simple family (application)
US 11569402 A 20020404; AT 03718211 T 20030403; AU 2003221812 A 20030403; BR 0308931 A 20030403; CA 2481247 A 20030403; CN 03812903 A 20030403; EP 03718211 A 20030403; JP 2003584594 A 20030403; RU 2004132207 A 20030403; US 0310416 W 20030403; US 79209704 A 20040303; ZA 200407915 A 20040930